Machine for finishing knife-blades.



Patented Feb. l8, I902.

I A. L. SWEET.

MACHINE FUR FINISHING KNIFE BLADES.

(Application filed June 7, 1901.)

(No Model.)

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' A. L. SWEET.

MACHINE FOR FINISHING KNIFE BLADES.

(Application filed June 7, 1901.) I (No Model.) 5 Sheets-Sheet 2.

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No. 693,75G. Patented Feb. l8, I902.

A. L. SWEET.

MACHINE FOB FINISHING KNIFE BLADES.

(Application filed. June 7, 1901.)

5 Sheets-Sheet 3.

(No Model.)

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No. 693,756. Patented Fab. [8, I902.

' A. L. SWEET.

MACHINE FOR FINISHING KNIFE BLADES.

(Application filed June '1, 1961.

(No Mode.

5 Sheets-Sheet 4.

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Illl I No. 693,756. Patented Feb. 18,. I902.

A; L. swan. MACHINE FOR FINISHING KNIFE BLADESJ A' ucapion filed June 7,1901.)

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Unaware STATES PATENT Fries.

ALONZO L'.

SlVEET, OF NORWICH, CONNECTICUT.

MACHINE FOR FINISHING KNIFE-BLADES.

SPECIFICATION forming part of Letters Patent No. 693,756, dated February18, 1902.

Application filed June 7,1901. Serial No. 63,557. (No model.)

To ctZZ whom it may concern:

Be it known that I, ALONZO L. SWEET, a citizen of the United States,residing at Norwich, New London county, Connecticut, have inventedcertain new and useful Improvements in Machines for Finishing Knife-Blades, of which the following is a specification.

My invention relates to machines forgrinding knife-blades after theyleave the forge preparatory to the polishing thereof. The machine isparticularly designed for operating upon the blades of ordinarytable-cutlery, and is intended to automatically grind the sides ofaknife-blade to remove the scales and pits which are on the same whenitleaves the forge, the operator only being required to place the knifeto be operated upon in a chuck and remove the same therefrom at thecompletion of the operation thereupon and to start the carrier mechanismfor the blade by means of a lever, this mechanism automatically stoppingat the end of a complete operation upon a knife.

To this end the invention includes a pair ofgrinding-wheels, a chuck tohold the article to be operated upon, and an oscillating andreciprocating carrier for the chuck, which will feed the knife first toone wheel, running the blade across the grinding-face of the same totreat one side thereof and then to the other wheel, moving the bladeacross the grindingface of the same to treat the reverse side of theblade.

It further includes means to hold the blade in contact with thegrindingwheels; and it further includes the mechanism for reciprocatingthe carrier and for oscillating the same at predetermined periods.

The invention is illustrated in the accompanying drawings, in whichFigure 1 is a side elevation of the machine; Fig. 2, an end view of thesame; Fig. 3, a detail plan View of the part of the apparatus carried byplate 15, this view also showing in section a fragmentary part of thegrinding-wheel; Fig. 4:, a detail end view of the knife-guidingmechanism. Fig. 5 is a vertical sectional view of the knife-chuck andholder therefor. Fig. (3 is a sectional View on line 5 5. Fig. 7 is ahorizontal sectional view. Fig. 8 is an end view of the chuckjaws. Fig.9 is aside elevation of the same. Fig. 10 is a detail sectional view ofa part of the mechanism for oscillating the knife-carrier. Fig. 11 is aplan view of the same, and Fig. 12 is a view of the under side of a partof said mechanism. Figs. 13 and 14 are modifications of a structuraldetail.

The entire grinding and knife-carrying mechanism of the machine issupported upon a hollow column 1, having a base-fiange 2, which restsupon the floor or other support for the machine and may be boltedthereto. To opposite sides of the column, near the top thereof, brackets3 are bolted, in thehorizontal portions of which guideways are providedto receive the bases of short standards or supports 4, which carry theshafts 5 and 6, upon the inner ends of which the grindingwheels 7 and 8are fixed. The standards are adjusted by means of hand-wheels 9, fixedto the ends of screws 10, passing through bosses 11 of the brackets 3and threaded into the bases of said standards. These adjustments permitthe grinding-Wheels to be accurately positioned in relation to the Wayalong which the work travels and to be shifted to compensate for wear tomaintain the grindingfaces of the wheel in the predetermined position inrelation to the path along which the work is moved.

In constructing the grinding-wheels a metal backing-disk 12, having adovetail groove in the face thereof, is employed which has thereon aring of emery. The ring is locked in place by forcing a portion of thesame into the groove in the disk during the molding operation. The diskswith the emery facings are bolted to carriers 13, fixed to the ends ofthe shafts 5 and G.

Ribs 14, formed integral with the rear side of the column, provide aguideway in which the vertical portion of an angle-plate 15 is guided.This plate is adjusted vertically by means of a hand-wheel 16 and screw17, held against longitudinal movement in a lug 14, extending from thecolumn, the threaded portion thereof engaging a threaded opening in alug 18, projecting from the vertical portion of the angle-plate. Fromthe opposite sides of the bottom of the horizontal portion-of theangle-plates brackets 19 depend, in which the main drive-shaft 20 isjournaled. One end of this shaft extends through one of the brackets andcarries a drive-pulley 21 and clutch 22 for connecting the latter to theshaft. From approximately the center of the under face of the horizontalportion of the angle-plate 15 a hollow boss 23 depends, in whichisjournaled a second hollow boss 24, depending from the under side of aturn table 25, held in place on the angle-plate by oppositely-locatedclamps 26.

A casing 27, formed integral with or rigidly secured to the turn-table,is provided with ends having hearings for the journals of a double screw28, contained between the walls of the casing. The journal at theforward end of the screw has a beveled gear 29 fixed thereto, whichmeshes with a corresponding gear 30, fixed to the end of a short shaftextending through boss 24 and carrying at its lower end a worm-wheel 31,which meshes with a worm on the main shaft 20. In this manner screw 28is rotated from the main shaft.

To the upper edges of the sides of the casing 27 strips 32 are bolted toprovide guideribs, which project into grooves 33 in the sides of asliding carriage 34. The latter has a stud 35 journaled therein,provided with a tongue 36, which fits the grooves in the double screw.Thus as the double screw is rotated, as before mentioned, the slidingcarriage will be reciprocated. The head of the carriage, at the forwardend thereof, is provided with a dovetail vertical way into which acorrespondingly-shaped rib projecting from the rear face of achuck-casing 37 loosely fits. Within the casing jaws 38 39 are locatedfor gripping the handle of the knife to be operated upon. The jaws arepivoted on two vertical screws 40, so that they may turn in a horizontalplane for a purpose to be hereinafter described, but are normally heldin a central position by fiat springs 41, fixed at one of their ends tothe walls of the socket within the casing, their free ends pressingagainst said jaws. The jaws are held together by screws 42, passingthrough the same near each corner thereof.

Afterthe handle of a knifeis inserted in the receiving-socket betweenthe jaws a clamp ing-screw 43, threaded in an opening in the upper jaw,is screwed down to bind the same in place. Working in connection withthe chuck is a pivoted gage 44, which is swung down aftera knife isplaced in the chuck and before screw 43 is tightened up. After the knifeis properly positioned in relation to the gage the screw 43 is tightenedand the gage swung back out of the way.

Bolted to the face of the angle-plate and projecting in between thegrinding-wheels through a cut-out portion in the top of the column is aplate 45, to which guidebars 46 are bolted, the latter diverging from apoint near the turn-table where the ends thereof are in closejuxtaposition. Upon these bars the knife-blade holders are reciprocatedby means to be described. Each holder is provided with a ledge 48 on theside nearest the adjacent emery-Wheel, upon which the back of the bladeto be ground is seated, and this ledge, which in width must be slightlyless than the width of the back of the knife, converges from its widestpart at the rear end of the holders toward the front end thereof, Whereit vanishes into the sides of said hold ers. To a studprojecting-inwardly from near the front end of each holder a link ispivotally attached at one end, the opposite ends of said links beingpivotally secured to each other by a pin 50, which extends through saidends and projects into a way 51, extending longitudinally of plate 45,centrally of the same. Thus the holders are'connected up, so that whenmeans are connected to one for reciprocating the same the other one willmove in unison therewith. Each of the holders is provided with a recess60, extending across its face at the rear end of the same, with which ahook 52, fixed to the forward end of the reciprocating carriage, isdesigned to engage. The holders are thus coupled to the carriage toreciprocate therewith, as will be explained in detail hereinafter.

At the end of the operation upon a knife the reciprocating carriage andholders are retracted their full limit, which brings the rear end of thelatter in juxtaposition. The oscillating table at this time is in aposition midway between the extreme positions assumed thereby during itsoscillation.

To each side of the casting 27, at the front end of the same, a verticalplate 53 is bolted, in which corresponding slots are cut, incliningupwardly from the front edges of said plates.

At each side of the chuck rollers 54 are journaled, which as thecarriage nears the completion of its rearward reciprocation enter saidslots, and as the carriage continues to recede move up the incline wallsof the same, thereby lifting the chuck, which raises the blade of theknife above the plane of the upper edges of the holders. This is theposition the chuck is in at the end of a complete operation upon aknife. After a new knife to be operated upon is placed in the chuck andthe drive-pulley thrown in, as will be hereinafter described, theoscillating table is operated and moves from its central positiondescribed to one of its extreme positions. This alines the carriage withone of the guide-bars and brings the hook 52 into position to engagewith the holder guided on said bar. As the carriage feeds forward thechuck rollers travel down the incline in plates 53, bringing the back ofthe blade of the knife against the ledge in the holder. Theupper edgesof the holder are beveled or curved, so as to guide the blade in itsdownward movement, the jaws of the chuck being flexibly supported, asbeforestated, to permit each guide to press the knife laterally a slightdistance. To prevent the chuck dropping down too far, a limiting-screw61 may be provided.

carriage is now reciprocated forward and back, the holder pressing theblade against the grinding-face of the emery-wheel. As the The carriageretracts the chuck is again raised, and while in this raised positionthe oscillating table is moved over into its other extreme position, thehook moved out of engagement with the first holder and into engagementwith the second, the blade seated on the ledge on the second holder, andsaid holder reciprocated, thus bringing the opposite side of theknife-blade against the second emery-wheel.

The means for starting the machine and for automatically stopping thesame at the completion of the work upon a knife will now be described.From the rear edge of the horizontal portion of the angle-plate 15 ateach side thereof a lug depends in which a shaft 64 is keyed so as tohave longitudinal move ment. To this shaft an arm 65 is secured,connected at its other end by a link 66 to a pivoted lever 67 ,whichengages with and controls the clutch for connecting the drive-pulleywith the main shaft. A collar 68 is pinned to the shaft 64, againstwhich a hub carried by a lever 69 loose on shaft 64 is pressed by aspiral spring 7 O, which also tends to hold the arm up, and a roller 71,journaled on an extension of the hub, in the path of the oscillatingguide for the carriaget'. e., casing 27. This spring tends to press theshaft 64 in the direction indicated by the arrow, so as to hold theclutch in. However, on the completion of the grinding of a knife-bladethe rear end of the carriage-guide is swung against roller 71, forcingthe same over against the tension of. the spring and releasing theclutch, the machine at once coming to a stop. To start up, the lever 69is depressed, carrying roller 71 below the edge of carriage-guide 27,freeing spring 70, which at once shifts shaft 64 longitudinally andthrows in the clutch through the connections described. In the firstmovement of casing 27 the rear end thereof swings in the direction ofarrow 27, Fig. 3, and as the roller 71 is held depressed by the operatorthe casing will pass above the same. The operator may then release lever69, and the casing 27 willhold the roller 71 down until it is swingingover toward the opposite side of the machine. The roller will assume itsuprightposition as soon as it is freed from the casing and stand in aposition to be struck and shifted by the casing 27 as the casing isagain swung in the direction indicated by arrow 27.

The mechanism for automatically oscillating the table at predeterminedintervals will now be described. Extending through the angle plate and asecond boss depending therefrom is a shaft 71, having a worm-gearsecured to the lower end thereof, which meshes with a second worm 72 onthe main shaft. Pinned to the upper portion of shaft 71 is disk 73,having internal ratchet-teeth, the upper face of the angle-plate beingrecessed to receive the disk. Mounted loosely upon the extreme end ofthe shaft and held thereon by the head of the shaft bearing upon theupper side of the same is a disk 74, having a lug projecting fromthefperiphery of 73 and beneath the lug 75.

the same and a cut-out portion in its under face adjacent to said lug,in which a dog is located, the latter being pivotally connected to thedisk byapin 76. The dog is normally pressed outwardly into engagementwith the teeth of the ratchet by a spring 77. The tail of the dogextends over the edge of the disk Both the lug 75 and the tail 76 of thedog in the rotation of the parts travel in an annular channel in theface of the angle-plate surrounding said disks. A channel 77 in the faceof the angleplate, running transversely of the same and having twobranches 78 79, which intersect with the'channel 80, receives a bar 81,having two branches 82 83, which move in the branch channels 78 79 andare provided with inwardly-extending lips 84 85, designed to coact withlug 75 and the tail 76 of the dog. The upper face of disk 74 is providedwith a way 86, in which a nut 86 is held, the latter being secured tothe end of a pin 87, depending from one end of a link 88, the other endof which is pivotally connected to the end of the oscillation-table.During the rotation of the main drive-shaft the disk 73 is continuouslyrotated, and when the dog is in engagement with the ratchet-teeththereof it rotates the disk 74 therewith. At the commencement of theoperation of the machine the bar 81 occupies such a position that thelip 84 is held in the path of rotation of lug 75 and the tail 76 of thedog. The connection between the link 88 and the disk 74 is in a positioncentrally between the extreme positions which the same assumes in theoperation of the machine. Therefore, as before stated, the oscillatingtable is held in a central position. Assuming that the main shaft is nowstarted, the disk 73 is rotated. The dog being in engagement rotates thedisk 74-, which pulls the link 88 over, moving the oscillating table inone direction the extreme limit of its movement. At this period lug 75and tail 76 strike lip 84. The dog is immediately disengaged from theratchet and the rotation of disk 74 arrested. The carriage now feedsforward, as before described, along the line into which ithas beenmoved. At the rear end of each of the combined holders and guides a pin87 depends, which is designed to engage with the end of one of thespringheld detents 89 90, pivoted to the bar 81, when said ends extendinto the path of said pins. As the machine starts detent 90 is heldretracted by the pin on the holder, which first receives the knifeblade, and detent 89 is pressed against the side of the adjacent holder48 by its spring. v As soon as the end of holder 48 passes the end ofdetent 89 in the forward stroke of the former the spring controlling thelatter will throw the forward end of the same into the path of the pin87, depending from said holder. As has been described before,

the holders move in unison, so that the rearward movement of thecarriage draws both of the said holders along, bringing the pin de- IIOpending from the holder out of use into engagement with the detent inits path and therethrough shifting bar 81, which moves lip 84 out of thepath of lugs and tail 7 6 and lug into the path of the same. As soon asthe tail 7 6 is released the spring-pressed dog will reengage theratchet, which will couple disk 74 to disk 73 again, and the two willrotate together until the lug and tailstrike lips 85, when disk 74 willagain'be arrested. During the period lug 75 is moving from lip 84 to lip85 the disk makes a one-half revolution, which through link connectionmoves the tn rn-table over into its opposite extreme position,- and "thecarrier again moves forward and back, carrying the knife-blade againstthe second emery-wheel to grind-the opposite face of the blade. When thebar 81 is shifted, the end of the detent is brought into the path of thepin depending from the first blade-holder, so that on the secondrearward movement-of the carriage the bar 81 is again shifted in areverse direction, again moving lip 84 into the path of lug 75 andtail'76 and releasing them from lip 85. The two disks again start torotate in unison; but'by the time they have made a quarter-rotation thecarriage-guide 27 has engaged wheel 71 and through the beforedescribedmechanism thrown the clutch out, disconnecting the drive-pulley from themain drive-shaft, and the machine stops.

As'before stated, the angle-plate maybe adjusted vertically of thesupporting-colu mn. This permits the horizontal-plane in whichthe-knife-carrier' and parts cooperating therewith work to be varied inrelation to the emery wheels, sothat'the knife-blade may be reciprocatedacross the said wheels in a plane centrally of the axles of the sameorin planes to either side of 'said central position at the option ofthe operator.

It will be understood from the foregoing that theoperator in startingthe machine merely has to place a knife in the chuck and depress lever69. The machine then automatically grinds both sides of the blades andcomes to a complete stop when this is accomplished.

To supply the emery-wheels with water, a pipe 90 is provided withbranches 91 92, which lead in through the hinged cap 93, provided tocover the upper portion of the wheel to prevent the water being thrownout by centrifugal force during the operation of the machine. At theinsertion of the branch pipes with the main pipe a three-way cock isplaced which may be automatically controlled by a lever connection tothe oscillating part of the machine, so that the supply of water may beautomatically cut off to one wheel and turned on the other as theknife-blade is transferred from one wheel to the other.

The column 1 is interiorly provided with synclinal walls 94, which formthe bottom of a chamber provided to catch the dripping from theemery-wheels, and from this chamber a suitable outlet 95 leads.

wheels 9 to the side of column 1. A bronze bushing e surrounds theshaft 1) inside of boss 0. This bushing is held against rotary movementby a pine, secured in boss 0, having its head extending into a slot insaid bushing. A similar but longer bushing g surrounds shaft b 'withinboss 0. The opposite end portions of the bushing g are provided withthreads g, which project beyond the ends of said boss 0 and are engagedby interior threads of ratchet- Upon the hubs of the latter the endsofthe arms 9 are swiveled, the latter being connected by a cross-piecewhich provides a hand-grip 9 Each arm carries a sliding-detent h,designed to engage the teeth of the ratchet-wheels to couple theswiveled handle formed by said arms and hand-grip to the ratchet-wheels,so that the parts will turn together. The detents are connected by a"cross-piece 2', upon which a spring 1', secured to hand-grip g bears,whereby the detents are normally held in engagement with theratchet-wheels. To disengage the detents, the grip g and cross-piece 'iare forced together against the tension of the spring. The drive-pulleyZ is suitably keyed to shaft 1) and abuts at one end the end of bushingg. The opposite end of said bushing abuts the face of an adj usting-nutm, screwed upon the end of shaft 1) and retained in place by a lock-nutm. The nut m is adjusted on shaft b to bring the end of the hub aagainst one end of bushing 6, a space-block 0 against the other end ofsaid bushing, the hub of pulley l against block, and the end of bushing9 against the hub. It will be apparent that with the parts in thisposition and the handle and ratchetwheels coupled together a movement ofthe handle in either direction will impart a like movement to theratchet-wheel and through the threaded connection between said wheelsand bushing g shift the same axially. The bushing g is prevented fromrotating by a pin 10, screwed in boss 0, the head of which extends intoanarrow slot in the under side of the bushing. By reason of the partsarranged on shaft b abutting each other any axial movement of bushing 9will be imparted to shaft b,whereby the position of the wheel a will bealtered. I

I claim as my invention' 1. In a machine for grinding knife-blades incombination, a grinding medium, a knife-carrier and means forreciprocating the same to move the blade along the grinding medium andmeans for moving the carrier to shift the knife laterally in relation tosaid reciprocating movement to bring first one side and then the otherside of the knife-blade against the grinding medium, substantially asdescribed.

2. In a machine for grinding knife-blades,in combination two grindingdevices,a knife-carrier and means for reciprocating the carrier to movethe knife-blade across the grinding devices and means for oscillatingthe carrier to bring the blade into position to be ground by one deviceand then the other, substantially as described.

3. In a machine forgrindingknife-blades in combination agrinding-wheel,a knife-carrier, a holder for pressing the blade of theknife against the wheel and means for automatically placing the blade ofthe knife in the holder and removing the same therefrom, substantiallyas described.

4. In combination in a knife-grinding machine, two grinding-wheels, aknife-carrier, a knife-blade holder for each wheel, and means forautomatically placing the blade in one holder and for automaticallytransferring the same to the other holder, substantially as described.

5. In combination in a knife-grinding machine, two grinding-wheels, aknife-holder for each wheel, a carriage with means for reciprocating andoscillating the same, a chuck secured to the carriage and means forcontrolling the chuck to raise and lower the same whereby the knifebladeis placed in and removed from said holders, substantially as described.

6. In combination, a grinding device, a knife-carrier, a knife-bladeholder and means for reciprocating the carrier and a coupling betweenthe carrierand holder for reciprocating the latter with the former,substantially as described.

7. In combination, two grinding devices, a single knife-carrier, aknife-blade holder for each grinding device, and a device on the carrier adapted to engage either holder and means for reciprocating andoscillating the carrier, substantially as described.

8. In combination, two grinding devices, a knife-carrier, a knife-holderfor each device, a fixed guide for each holder, means for reciprocatingthe carrier, means for oscillating the same to bring the carrier firstinto alinement with one holder and then the other, and a connection onthe carrier adapted to engage either holder, substantially as described.

9. I11 combination, a grinding device, a knife-carrier, a chuck-casing,means for raising and lowering the chuck-casing, a knifeholderhavingaseat for the blade of the knife, the edge of the holder forming aguide to said seat, jaws in said casing for gripping the knife and meansfor yieldingly supporting the jaws to permit the same to swing in ahorizontal plane substantially as described.

10. In combination, a grinding device, a knife-carrier, a knife-holderhaving a seat for the blade, the edge of the holder forming a guidethereto, a chuck-casin g, means for raising and lowering said casing andgrippingjaws pivoted in the casing and springs interposed between thewall of the casing and the jaws, substantially as described.

11. In combination, oppositelyarranged grinding-wheels with means forrotating the same, a single knife-carrier with means for reciprocatingthe same, a guide-bar for each wheel, said bars being located betweensaid wheels, a knife-blade holder guided on each bar, and means forchanging the knife-blade from one holder to the other at the end of afull stroke of the carriage, substantially as described.

12. In combination, a grinding device with means for operating the same,a knife-carrier, means for reciprocating and oscillating the same, meansfor holding the knife-blade, and means for adjusting said carrier andoperating means and said blade-holding means-in relation to the grindingdevice, substantially as described.

13. In combination, a base-column, a grind ing device supported therebywith means for operating the same, a plate adjustably supported on saidcolumn and a knife-carrier and operating means therefor carried by saidplate, substantially as described.

14. The combination with a column and grinding means carried thereby, ofa plate adjustably supported on said column, and a knife-carrier withmeans for reciprocating and oscillating the same and knife-blade-holdingmeans supported on said plate, substantially as described.

15. In combination, two grinding devices, a reciprocating carriage withmeans for operating the same, a knifeholder operated thereby, a guidefor said carriage and means for oscillating the guide, substantially asdescribed.

16. In combination, two grinding devices, a carriage,a screw with meansfor rotating the same, a connection between the carriage and screwwhereby the latter is reciprocated by the rotation of the former, aknife-holder secured to the carriage and a guiding device for thecarriage with means for oscillating the same, said guiding devicecontaining said screw, substantially as described.

17. In combination, two grinding devices, a carriage with means forreciprocating the same, a blade-holder for each grinding device having aseat for the knife-blade, a chuck for holding the knife moving with thecarriage and slidably connected thereto to have independent movement,means for oscillating the 'carriage and means for automatically raisingand lowering the chuck, substantially as described.

18. In combination, two grinding devices, a carriage with means forreciprocating the same, a blade-holder for each grinding device having aseat for the knife-blade, a chuck forholding the knife moving with thecarriage and slidably connected thereto to have independent movement,means for oscillating the carriage, projections on the chuck and fixedinclined guides adapted to engage said projections during the movementof the carriage to raise and lower the chuck, substantially asdescribed.

19. In combination, two grinding devices, a carriage with means forreciprocating the same, a guiding device for the carriage, means foroscillating the same to shift the carriage laterally, a blade-holder foreach grinding device having aseat for the blade, a chuck having asliding connection to the end of the carriage, plates secured to theforward end of the carriage, said plates having inclined guide-slotstherein and projections on the chuck cooperating therewith in thereciprocatory movement of the carriage to raise and lower the chuck,substantially as described. V

20. In combination, two grinding devices with means for operating thesame, a carriage, a main drive-shaft, a drive-pulley, clutch mechanismfor connecting the pulley to the shaft, means operated from thedriveshaft for reciprocating the carriage, a guiding device for thecarriage, means for oscillating the same, driven from said shaft,mechanism for controlling the clutch, said oscillating guiding devicecoacting therewith to throw said clutch out, substantially as described.

21. In combination, two grinding-wheels, with means for rotating thesame, a carriage, a knife-holder carried thereby for reciprorocating thecarriage, a guiding device for the carriage, means for oscillating thesame driven from said shaft, a drive-pulley,c1utch mechanism interposedbetween the pulley and the shaft, an arm having an engagement with theclutch mechanism to throw the same in or out, a reciprocatingshaft, aconnection between the shaft and said arm for controlling the latterfrom the shaft, a stop on the shaft, a spring, a device interposedbetween the spring and stop adapted to be held in the path of theoscillating guide, said spring being adapted to press said interposeddevice against the stop to shift the shaft and hold in the clutch, saidoscillating guide striking the interposed device at the end of its movement in one direction whereby the said device and thereciprocating-shaft are shifted against the tension of the spring andthe clutch thrown our,substantially as described.

22. In combination, two grinding-wheels, with means for rotatingthesame, a carriage, a knife-holder carried thereby for reciprocatingthe carriage, a guiding device for the car' riage, means for oscillatingthe same driven from said shaft, a drive-pulley, clutch mechanisminterposed between the pulley and the shaft, an arm having an engagementwith the clutchimechanism to throw the same in or out, a reciprocatingshaft, a connection besame and the reciprocating shaft against thetension of the spring whereby the clutch is thrown out and the machinestopped, said 1ever being adapted to be actuated manually to carry saiddevice out of the path of the oscillating device, whereby the springwill again throw in the clutch, substantially as described.

23; In combination, two grinding-wheels, a carriage, a knife-holderfixedthereto, a driveshaft, means driven therefrom for reciprocating thecarriage, a guiding device for the carriage, means driven from saidshaft for oscillating said device from a central position to one sideand then back to the other and again to said central position during theperiod the carriage is making two complete forward and backreciprocations, a drive-pulley, clutch mechanism interposed between thesame and the shaft, a device held under tension in the path of theoscillating guide, said device having controlling means for shifting theclutch, said oscillating guide striking and moving the device on itsfinal return to said central position whereby the clutch is thrown outand held out, means for manually moving the device out of theoscillating guide, and means for shifting the device to throw in theclutch when said device is moved out of the path of the guide, saidguide automatically holding the device out of its path during the firstportion of its oscillatory movement, substantially as described.

24. In combination, two grinding-wheels, a carriage, a knife-holderfixed thereto, a driveshaft, means driven therefrom for reciprocatingthe carriage, a guiding device for the carriage, means driven from saidshaft for oscillating said device from a central position to one sideand then back to the other and again to said central position during theperiod the carriage is making two complete forward and backreciprocations, a drive-pulley, clutch mechanism interposed between thesame and the shaft, a device held under tension in the path of theoscillating guide, said device having controlling means for shifting theclutch, said oscillating guide striking and moving the device on itsfinal return to said central position whereby the clutch is thrown outand held out, means for manually moving the device out of the path ofthe oscillating guide, and means for shifting the device to throw in theclutch when said device is moved out of the path of the guide, saidguide automatic ally holding the device out of its path during' thefirst portion of its oscillatory movement, said shifting means for thedevice returning the same to its position into the path of theoscillating device at the completion of the first part of theoscillatory movement of the guiding device, substantially as described.

25. In combination, two grinding-wheels, a carriage, means forreciprocating the same and oscillating device providing a guide for thecarriage and means for giving said device its oscillatory movementcomprising a main IIO drive-shaft, a disk, connection between the diskand said device, and means for rotating the disk driven from the mainshaft, substantially as described.

26. In combination, two grinding-wheels, a main drive-shaft, a carriage,means for reciprocating the same, driven from said shaft, a pivotedguiding device for the carriage, and means for intermittentlyoscillating the same on its pivot comprising a disk, a link connectionfrom the face thereof to the guiding device, and clutch mechanismbetween said disk and drive-shaft with means for throwing, the same inand out, substantially as described.

27. In combination, a grinding device, blade-holding means, acarriage, amain driveshaft, means driven from said shaft, for reciprocating thecarriage,aconnection between the carriage and said holding means forreciprocating the latter in unison with the former, a chuck for theknife secured to the carriage, a pivoted guiding device for the carriageand means for oscillating said device comprising a disk, a linkconnection between said disk and guiding device, a clutch between themain shaft and said disk for rotating the latter and means for throwingsaid clutch in and out to give said disk an intermittent movement, saidmeans being controlled by said knife-blade-holding means, substantiallyas described.

28. In combination, two grinding-wheels, a carrier,a knife-holdercarried thereby,a knifeblade holder for each wheel, means for guidingthe same, a main drive-shaft, means for reciprocating the carrier andblade-holders therefrom, a guiding device for the carrier and means foroscillating the same to transfer the blade from one holder to the other,said means comprising a disk, a link connection pivotally secured at oneend eccentrically of the disk and at its opposite end to said device, asupplemental shaft driven from the main shaft, a clutch connectionbetween the supplemental shaft and the said disk, a reciprocating barcarrying means for releasing said clutch and means carried by the barcoacting with said blade-holders for controlling the bar, substantiallyas described.

29. In combination, two grinding-wheels, a

carrier,a knife-holder carried thereby,a knifeblade holder for eachwheel, means for guiding the same, a main drive-shaft, means forreciprocating the carrier and blade holders therefrom, a guiding devicefor the carrier and means for oscillating the same to transfer the bladefrom one holder to the other, said means comprising a disk, alinkconnection pivotallysecured at one end eccentrically of the disk and atits opposite end to said device, a supplemental shaft driven from themain shaft, a ratchet fixed thereto, a springpressed dog carried by thedisk normally held in engagement with the ratchet, a reciprocating bar,stops carried thereby located on opposite sides of the disks, a tail onsaid dog, one of said stops being always in the path of said tailwhereby said dog will be tilted out of engagement with the ratchet whenit strikes said stop and the disk disconnected therefrom, means on thedisk coacting with said stops to arrest the rotary movement of the diskwhen the dog is tilted, pins depending from the bladeholders, aconnection between the holders whereby the same are reciprocated inunison, and detents pivoted to the bar, one of said detents coactingwith the pin on one of the holders on each rearward reciprocation of theholders, whereby said bar is shifted on each rearward reciprocation ofthe holders to free the stop then in engagement with the tail of the dogand to move the oppositely-arranged stop in the path of the same,substantially as described.

30. In a grinding-machine, two grindingwheels, a carrier for the articleto be ground, means for oscillating the same to bring said article intocontact with one wheel and then the other, a main water-supply pipe,branch pipes leading therefrom to said grindingwheels, a cockcontrolling the supply from the main pipe to the branch pipes and meansintel-posed between the cock and the oscillating means for controllingthe latter, substantially as described.

31. In a grinding-machine, a hollow supporting-column, grinding-wheelssupported thereon, mechanism for holding and controlling the article tobe ground also supported thereon, a water-feed, synclinal wallsextending between the interior walls of the column forming therewith adrip-chamber and an outlet therefor, substantially as described.

32. In combination, agrinding-wheel,a sup porting-bracket, a shaftcarrying said wheel, and means for shifting the shaft axially comprisinga handle swiveled on said shaft and means interposed between the sameactuated by the movement thereof for converting the rotation thereofinto a reciprocating movement and imparting the same to said shaft,substantially as described.-

33. In combination, a grinding wheel, a shaft carrying the same, abracket having bearings therefor, interposed bushings, one of saidbushings having a threaded portion, a ratchet-wheel having acorresponding threaded portion engaging the same said wheel abutting thebracket, means for holding the latter bushing against rotation, aswiveled handle, a detent carried thereby for coupling the same to saidratchet-wheel, and a nut threaded on said shaft abutting said bushing,substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

ALONZO L. SWEET.

Witnesses:

REUBEN S. BARTLETT, WILLIAM W. IvEs.

